Friction detent



May 29, 192s, 1,671,390

R. K. WINNING FRICTION' DETENT Filed March 14, 1927 I N VEN TOR.

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Patented May 29, 1928.

UNITED STAT-Es ROBERT X. WINNING, OF WAUWATOSA,` WISCONSIN, ASSIGNORTOCLUM MANUFAC- TUBING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OFWISCONSIN.

FBICTION DETENT.

Application ledpiharch 14, 1927. Serial No. 175,194.

This invention relates to improvements in friction detents. I

It is the object of the invention to slmpllfy the construction andreduce the expense of manufacture of friction detents used in connectionwith the reciprocable control of any part by means of a so-called Bowdenwirel and its iexible sheath or housing.

The drawing shows an axial section of a control device incorporatingafriction detent embodying this invention.

The mounting of the parts 1s illustrated more particularly in myapplication No. 79,760, filed January 7, 1926, under a llike title. Themounting, however, is not necessary to an understanding of the presentAinvention in which the friction` devices shown in such priorapplication have been eliminated. l

A handle rod` 1 headed at 2 for manual manipulation is axiallyreciprocable through a tubular housing 8 to which the `iiexible sheath 4of the Bowden wire 5 is anchored inthe usual manner. This sheath is madeup of a helically wound piano wire, or the like, and forms a tube withinwhich th wire 5 is guided for reciprocation.

The end of wire 5 is offset to provide a transverse coupling portion -aty-receivable through an aperture 7 which connects they longitudinalchannels -8 and 9 in the end of the handle rod, thereby enabling thehandle rodto transmit axial movement to the wire.

The presentinvention involves the formadulations, as shown at 10, in theBowden Wire 5,-bringing an intermediate portion of such wire intocontact with opposite sides of lthe flexible sheath 4. sThe curvilinearbends 10 tend to maintain their respective positions in the crevicesbetween successive coils or turns of the wound sheath 4 and hence act asa friction detent to maint/ain the handle rod 1 and Bowden wire 5 in anydesired position of adjustment. The bends may, if desired, be' made ofsuch radius as to cause a slight distortion or flexing of the sheath atthe location of thebend as illustrated in the drawing. Where thisconstruction is adopted, the positioning of the parts is more positivethan is the case if the bends are of just suiiicient radius to contactyieldably the interior surfaces of successivo coils in the sheath.

It will be obvious that by this simple expedient of producing slightbends in the Bowden wire, much expense may be saved in the manufactureand assembly of other forms of detents such as are usually applied tothe handle rod.

I claim:

1. A device of the character described, including a flexible sheath, anda wire reciprocable therein and formed with a sheath distorting bend forpressure engagement vwith the interior of the sheath.

2. A 'device of the character described,

comprising the combination with a flexible sheath, of'a wirereciprocable therein and provided with reverse bends contacting oppositesides of the sheath, said bends having their outermost portions at agreater' transverse spacing'as measured transversely to the normal axisof said sheath than'the'normal interior diameter of the sheath, wherebythe sheath is distorted slightly to accommodate it to said bends. p' f3. A device of the character described, including thel combination witha helically wound wire sheath having crevices between itsv consecutiveturns,l of a member reciprocable in said sheath and provided with offsetportions adapted yieldably to. engage in saidl crevices.

4. A device of the character described, in. cluding the combination witha helically wound wire sheath having crevices between its consecutiveturns, of a member reciprocable in said sheath and provided with oisetportions adaptedl yieldably to engage in said crevices, said membercomprising a wire and said portions comprising an oset curvilinear bendtherein of such dimensions as to distort said' sheath. l

ROBERT K. WINNING.

